/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.beam.runners.dataflow;
import java.util.ArrayList;
import java.util.List;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.runners.TransformHierarchy;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.values.PValue;
/**
* Provides a simple {@link org.apache.beam.sdk.Pipeline.PipelineVisitor}
* that records the transformation tree.
*/
class RecordingPipelineVisitor extends Pipeline.PipelineVisitor.Defaults {
public final List<PTransform<?, ?>> transforms = new ArrayList<>();
public final List<PValue> values = new ArrayList<>();
@Override
public void visitPrimitiveTransform(TransformHierarchy.Node node) {
transforms.add(node.getTransform());
}
@Override
public void visitValue(PValue value, TransformHierarchy.Node producer) {
values.add(value);
}
}